function color(){
    document.querySelector("body").style.background = "red";
}
function color1(){
    document.querySelector("body").style.background = "blue";
}
function color2(){
    document.querySelector("body").style.background = "yellow";
}
function color3(){
    document.querySelector("body").style.background = "green";
}
function color4(){
    document.querySelector("body").style.background = "black";
}